Add isSilentMode initially hidden before API council approval, test case to be added separately.

      * {@hide}

      * {@hide}

      */

      */

     private IBinder mICallBack = new Binder();

     private IBinder mICallBack = new Binder();

    /**

     * Checks whether the phone is in silent mode, with or without vibrate.

     *

     * @return true if phone is in silent mode, with or without vibrate.

     *

     * @see #getRingerMode()

     *

     * @hide pending API Council approval

     */

    public boolean isSilentMode() {

        int ringerMode = getRingerMode();

        boolean silentMode =

            (ringerMode == RINGER_MODE_SILENT) ||

            (ringerMode == RINGER_MODE_VIBRATE);

        return silentMode;

    }

}

}